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a:hover{color:green;}
li:first-child {color: red;}
li:last-child {color: blue;}
li:nth-child(2) {color:green;}
li:nth-child(3) {color:pink;}
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 <h1><a href="https:baidu.com">百度链接</a></h1>
 <ul>
<li>友情提示！</li>
<li>友情提示！</li>
<li>友情提示！</li>
<li>友情提示！</li>
<li>友情提示！</li>
<li>友情提示！</li>

</ul>
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<img src="/Users/m/Desktop/3.gif">
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